Ball joints are the pivot between the wheels and the suspension of
an automobile. Ball joints play a critical role in the safe
operation of an automobile's steering and suspension. Ball joints
can also be found in most linkage systems for motion control
applications, and should not be confused with spherical rod end
bearings, which are a different design.

Sealed ball joints do not require lubrication as they are "lubed
for life" but standard ball joints must be lubed from time to time.
It's best to inspect standard ball joints once a year. Generally
speaking, standard ball joints will outlive sealed ones because
eventually the seal will break, causing the joint to dry out and
rust. While there is no exact lifespan that can be put on a sealed
ball joint, they can fail as early as 80, 000 miles. Signs of a
failing ball joint start with a clicking or snapping sound when the
wheel is turned and eventually turns into a squeaking sound at the
end of a stop, when the gas pedal is used and/or also when hitting
bumps. Another symptom could be 'thud' noises coming from front
suspension when going over bumps.

If a ball joint fails, the results can be dangerous as the wheel's
angle becoming unconstrained, causing loss of control. Because the
tire will be at an unintended angle, the vehicle will come to an
abrupt halt damaging the tires. Also, during failure, debris can
damage other parts of the vehicle.

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UC100

Joint bearings application

Joint bearing is a kind of special structure of sliding
bearings.Joint bearings is widely applied in engineering, hydraulic
oil cylinder metalforming machine

Joint bearings classification

Such as SB type, type, GE, CF series, and the amount and type of
other types of the joint bearings and fixed-end joint bearings,
etc.